FCS PC-3 Surfing Surfboard Tri Fin Set - Red Color - RED Tri Fin Set - (3) fin set PC-3 Fin Stats: Base - 4.28" , 109.0 mm; Depth - 4.41" , 112.0 mm; Area - 14.22 sq. in. , 9172 mm2; Sweep - 31.0 Performance Core Fin: Performance Core (PC) material and construction is designed to deliver the feeling of a traditional glass fin with the added performance of reduced weight. The result is a lightweight fin with remarkable flex, a smooth feel and a n impressive aesthetic.